EP0094752B1 - Surgical stapler - Google Patents

Surgical stapler Download PDF

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Publication number
EP0094752B1
EP0094752B1 EP83302350A EP83302350A EP0094752B1 EP 0094752 B1 EP0094752 B1 EP 0094752B1 EP 83302350 A EP83302350 A EP 83302350A EP 83302350 A EP83302350 A EP 83302350A EP 0094752 B1 EP0094752 B1 EP 0094752B1
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EP
European Patent Office
Prior art keywords
driver
staple
stapler
staples
anvil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP83302350A
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German (de)
English (en)
French (fr)
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EP0094752A2 (en
EP0094752A3 (en
Inventor
Joseph Walter Blake Iii
Jack William Kaufman
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Individual
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Individual
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Publication date
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Priority to AT83302350T priority Critical patent/ATE31012T1/de
Publication of EP0094752A2 publication Critical patent/EP0094752A2/en
Publication of EP0094752A3 publication Critical patent/EP0094752A3/en
Application granted granted Critical
Publication of EP0094752B1 publication Critical patent/EP0094752B1/en
Expired legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/04—Surgical instruments, devices or methods, e.g. tourniquets for suturing wounds; Holders or packages for needles or suture materials
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/068—Surgical staplers, e.g. containing multiple staples or clamps
    • A61B17/0682—Surgical staplers, e.g. containing multiple staples or clamps for applying U-shaped staples or clamps, e.g. without a forming anvil
    • A61B17/0684—Surgical staplers, e.g. containing multiple staples or clamps for applying U-shaped staples or clamps, e.g. without a forming anvil having a forming anvil staying above the tissue during stapling
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/064—Surgical staples, i.e. penetrating the tissue
    • A61B17/0644—Surgical staples, i.e. penetrating the tissue penetrating the tissue, deformable to closed position

Definitions

  • This invention relates to improved stapling instruments, and more particularly to a surgical skin stapler which may be disposable after a single use or application.
  • the various stapling instruments developed and marketed heretofore in the medical profession comprise diverse constructions, such as manual and gas powered instruments, but none are yet widely accepted by all doctors for a number of reasons, such as poorvisibility of wound site, cost, reliability, bulkiness, lack of familiarity with the product, clumsiness and/or difficulty in use, mechanical complexity, etc.
  • Other surgical stapling instruments incorporate replaceable staple cartridges which may be changed when all of the staples in a single cartridge are utilized.
  • United States Patent No. 3,643,851 discloses a skin stapler with a staple cartridge and a trigger activated, gas-powered unit for driving a pusher forward to form the staple about an anvil and to eject the same prior to returning automatically to its initial rearward position in the stapler ready for the next stapling cycle or sequence.
  • Such instruments incorporating gas-powered driving means do not lend themselves to wide acceptance as they must use sterilized gas, and must be periodically recharged with fresh pressurized gas cartridges or cylinders and such a maintenance requirement is simply disruptive to a doctor or surgeon.
  • a spring-loaded means constantly urges and advances the staples along an anvil plate independent of the staple driver and the driving mechanism which actuates it.
  • a safety latch means to preclude inadvertent operation of the stapling instrument is provided in the stapler. Nevertheless, even though it employs a rotatable nose portion, its overall configuration, hand grip and vertical orientation to the wound site obstructs one's visibility of the work area.
  • 4,043,504 is specifically intended to be used with the surgical stapling instrument disclosed in United States Patent No. 4,196,836.
  • This instrument has a handle portion and a straight nose portion rotatively mounted in the handle portion.
  • the nose portion carries the instrument anvil and releasably supports the surgical staple carrying cartridges by means of a resilient latch configured to releasably engage the upper end of the cartridge in such a way as to urge the cartridge into abutment with both the nose portion and the instrument anvil.
  • United States Patent Nos. 3,819,100, 3,949,924 and the disposable skin stapler covered by United States Patent No. 4,204,623 all relate to manually-powered surgical stapling instruments and a staple-carrying cartridge, with a nose portion which is rotatably mounted in a hand-held main body portion so that the stapling angle can be varied without rotating the hand-held position of the stapler. Clutch means are also provided to ensure that the staple-advancing drive means is only activated once per stapling operation.
  • One of the disadvantages of the Auto Suture stapler is that its trigger is difficult to pull and it can inadvertently pinch flesh, fingers and linen or other items between the trigger and handle in certain positions of use.
  • a further medical stapling device is disclosed in United States Patent No. 4,185,762.
  • This device teaches a relatively simple structure wherein staples are moved along a track between grooved rails by a drive member having spaced lugs which are moved into engagement with the staples for advancing them along the track and simultaneously forming a first staple about an anvil. Rearward movement disengages the lugs away from the track so as to position the driver and its lugs for its next stapling cycle or sequence of continued operation.
  • United States Patent No. 4,202,480 deals with a medical stapler provided with a device which leaves the ram across the staple in the opening to prevent another staple from being fed (double feeding) into the channel if manual activation of the stapler is discontinued before staple ejection.
  • the stapler includes means for producing a "click" when the driver ram is moved fully to its eject position to provide both a tactile and an audible indication of the closing of a staple around the anvil.
  • U.S. Patent No. 4,256,251 teaches a surgical stapler having a magazine or cartridge of staples secured to a base by spring clips and a pair of toggle-joint linkage handles which serve to drive a staple forming ram and bend a staple around the anvil. When pressure on the handles is released slightly, the anvil then is slid out from under the top of the staple.
  • Other skin staple cartridges such as United States Patent No. 4,127,227 employ a staple cartridge embodying a belt system carrying a plurality of staples and ramp means for singly moving the staples out of the belt and into the plane of the pusher.
  • the staple is pushed from the magazine into the driver chamber where it is engaged by the driver and pushed down the chamber to the anvil where it is deformed.
  • Such a stapler also includes ratchet means for preventing a second staple from being fed into the guide while the one ahead of it is still being formed and yet to be ejected.
  • Another object of the invention is to provide an entirely new stapler design which improves visibility at the suture or wound site, and control in the positioning or staple placement.
  • a further object of the invention is to provide an improved skin stapler which has a slender, curved nose section and a closed handle and trigger portion, which are designed to function in an idealized manner with the human hand when in a clasped condition as in the case when pulling the trigger.
  • Yet another object of the invention is to provide a further improved skin stapler incorporating a driving mechanism which exhibits high driving forces within a confined area, but yet the manual force required to activate and drive the mechanism is small and easily and comfortably handled.
  • a still further object of the invention is to provide a skin stapler of the disposable type and one which holds a sufficiently large number of stored staples so that in most routine applications where the staples are used, switching instruments when the staples are exhausted is kept to a minimum.
  • a surgical stapler having stored therein a plurality of staples for suturing tissue, comprising a frame structure having first and second gripping means adapted to be held by a hand and an elongated nose section, one of said gripping means being a movable trigger portion and said elongated nose section being curved for providing improved visibility at the wound site; a translatable staple driver; a toggle mechanism including a force transmission means connected to said trigger portion for actuating said driver; an anvil located adjacent the end of said nose section about which one of said staples is formed by said translatable driver; a staple ejector for removing the staple from said anvil; and spring means for returning said translatable driver from a portion of forming said staple about said anvil to a staple reloading position, characterised in that said toggle mechanism further includes a drum rotatable by strap means biased by said spring means and connected to said trigger portion, and said force transmission means links together said driver and said drum.
  • the invention further concerns a surgical stapler for suturing tissue with staples, comprising a frame structure adapted to be hand held, including means for feeding, deforming and ejecting a formed staple, and further means for activating said means; and an approximating blade, disposed at the tip of said stapler where said staples are ejected, for centering the stapler about the approximated sides of the wound to be sutured.
  • one embodiment of the surgical stapler which is adapted to be hand held has a visible staple supply in the frame structure, with the frame structure further comprising an anvil and a housing structure having a single track therein for a driver-follower unit.
  • the follower is secured to the driver and is resiliently biased so as to continuously urge the plurality of staples which are stacked end to end atop the driver to a forwardly position.
  • a release member is disposed above the most forward staple for urging a staple into position in front of the driver, with the driver being manually actuated by actuating means for travelling between a forming position for closing said staple about the anvil and a retracting position in said track for reloading a next staple in front of said driver.
  • the driver upon retracting permits only a single staple to move independently of the actuating means into position in front of said driver without a direct actuation of the stapler.
  • Another form of skin stapler has stored therein a plurality of staples and has a frame structure, with a nose section for directing the staples at a suture site.
  • the stapler is also adapted to be gripped by a hand, with the stapler housing supporting an anvil, and having a single track encompassing a driver for deforming said staple about the anvil.
  • a staple follower is in juxtaposition to said driver for continuously urging said staples forwardly in the single track in cooperative association with a release member.
  • the stapler is provided with manually operated actuating means for actuating the driver in a substantially translatable direction by a toggle-like drive mechanism for forming a closed staple about said anvil, biasing means restores the driver to its unactuated position, and the staples are stacked and nested end to' end between the driver and the upper portion of the housing.
  • biasing means restores the driver to its unactuated position
  • the staples are stacked and nested end to' end between the driver and the upper portion of the housing.
  • the invention also encompasses a surgical staple for joining the severed skin or facia of a body comprising, prior to emplacement, a curved central portion, straight portions extending upwardly and outwardly from opposite ends of said curved central portion, straight portions extending upwardly and outwardly from opposite ends of said curved central portion at obtuse angles, and straight portions extending downwardly and outwardly from curved portions connecting said upwardly and outwardly straight extending portions with said downwardly and outwardly straight extending portions, and said straight portions being about equal in length to each other.
  • the stapler 10 comprises a frame 12, preferably comprising paired halves 14 and 16 having a rearward portion defining a gripping element, and including a generally translatable trigger element 18, preferably of a length which forms a closed handle portion substantially orthogonal to the top upper portion 20 of the frame 12.
  • the shape and grip is such as to be conveniently gripped with one hand by a surgeon.
  • a pusher or driver 22 is moved or generally provided with translational motion by means of an actuating drum 24 supported on a shaft 26 extending from half 14, said shaft 26 being in a suitable bearing support provided in the paired halves 14 and 16 of the frame 12.
  • a resilient strap 32 Wrapped about the actuating drum 24 is a resilient strap 32, preferably made of metal, such as stainless steel, anchored at one end, suitably by means of a closed loop 33 of the strap 32, to a pin 34, suitably affixed to the trigger element 18.
  • the other end 36 of the strap 32 is connected to resilient means, such as the return extension spring 40, for continually tensioning and urging rearwardly the "return” of the strap 32, and in turn the driver 22 through the action of the actuating drum 24, as will be explained in greater detail hereinafter.
  • resilient means such as the return extension spring 40
  • the actuating drum 24 is rotated about its shaft 26, as shown in phantom in Figure 2, when the trigger element 18 and strap 32 are pulled back by means of a pair of projections 42 (see Figure 3), suitably provided on the drum's peripheral surface 44 and which project through a suitable pair of mating apertures 46 in the strap 32.
  • the actuating drum 24 acts as a toggle mechanism in providing the necessary driving forces required to move the driver 22 and subsequently perform the forming and/or stapling operation for each staple used; with the driving forces acting tangentially to the peripheral surfaces 44 of the actuating drum 24.
  • the driver 22 comprises a front portion 48 and a rear channel shaped connecting portion 50, bendable and/or resilient in an intermediate flexible linking portion 51 as said intermediate portion 51 acts as a hinge between and transfers forces between said front and rear portions 48 and 50.
  • the driver 22 is also preferably of one piece construction.
  • the distal end of the rear connecting portion 50 is provided with suitable arcuate side elements 52 and 54 for connection to the actuating drum 24 about a pair of oppositely disposed lugs 56 and 58 formed by suitable recess means 60 cut into the side surfaces of the drum 24.
  • Such toggle driving arrangement provides the necessary high forces required to form the staple about the anvil 61 which is located on the bottom cover 84.
  • a negator spring 66 is suitably mounted about a shaft to the parallel sides 68 and 70 of the channel driver 22 and to a follower 72, for maintaining a continuing force on the follower 72.
  • the follower 72 continually urges the row of staples 74 against the formed front underside of an escapement spring 76 which is in mutual cooperative association with an open unformed staple.
  • the escapement spring 76 which is resilient also maintains a constant downward pressure for moving or shifting downwardly a single staple in front of the driver 22.
  • the staples 74 are retained beneath the opposite edges 77 of the cover 80 in a single track 79 which also accommodates the follower 72 and driver 22.
  • the follower 72 since it should freely slide between the driver 22 and the top cover 80, is preferably made of a material exhibiting low frictional resistance, such as "Delrin", a trademark of the DuPont Company of Wilmington, Delaware.
  • the escapement spring 76 is suitably secured, such as by welding, riveting or peened over pins 78, to the top cover 80.
  • a suitable ejector 86 Secured in a like manner to bottom cover 84 is a suitable ejector 86 which functions to eject a formed or closed staple 74 as is best shown in Figures 7a and 7b.
  • the escapement spring 76 may also be formed integrally with the top cover 80 and comprise a resilient cantilevered element stamped out from the central open cut-out area 81 in the top cover 80.
  • the shifting movement up and down of the ejector 86 is governed by a depression or "elongated" dimple 88 in the driver 22 and a mutually cooperative raised portion 90 on the ejector 86.
  • Figures 4a-7a clearly show the interaction and cooperative association between the dimple 88 of the driver 22 and the raised portion 90 of the ejector 86.
  • Alternate means for ejecting and a modified escapement spring may be employed as will be discussed hereinafter.
  • the bottom end 92 of the trigger element 18 is guided for translational movement in a bore 94, preferably of the blind type (although a through hole is also satisfactory), which the bore being disposed at an angle of about 14° to about 24° with the horizontal.
  • a bore 94 preferably of the blind type (although a through hole is also satisfactory)
  • the bore being disposed at an angle of about 14° to about 24° with the horizontal.
  • an angle of about 19° is employed as with this angle, a most satisfactory balance of forces is achieved with the hand in an open to closed position as when the hand is gripping the stapler.
  • This arrangement also ensures that as the staple is being formed and applied to a wound, the nose section of the stapler is maintained in a stationary manner and does not exhibit any "kicking up" action as do some of the prior art staplers, such as U.S. Surgical's.
  • the trigger element 18 also may comprise paired halves 96 and 98, each with a suitable slot 100 at their upper ends for guiding the trigger element 18 when actuated by pulling and for its return when released.
  • the trigger element 18 may be provided with gripping means, such as at least one finger grip 104. The index finger as the trigger 18 is squeezed is relieved of the power required to actuate the trigger element 18 and it thus provides maximum or total control to the stapling operation.
  • the nose section of the stapler being relatively thin (about 1/8-1/4 inch) and being curved downwardly provides increased visibility at the wound site which is vitally important to the surgeon as proper placement of the staples is greatly facilitated.
  • an approximating blade 102 which is mounted to (or held between) the housing may be provided with a suitable scored line (not shown) so that it can be removed by breaking it off should a particular surgeon desire not to utilize such a centering device.
  • the closed trigger loop of our skin stapler precludes catching or squeezing one's fingers, or flesh of the patient or snagging linen or other materials, etc., between the trigger and handle, which not only can cause considerable discomfort to a person, but also disturb the concentration of the doctor or surgeon during his suturing procedure.
  • the mechanism comprises a resilient deflecting follower or pawl arm 106, having a notched area 108, which may be, if desired, integrally molded into one of the paired halves 96 and 98, and a ratchet 110, preferably integrally formed with the driver 22, having top or track-like surface 112 and a front tooth 114.
  • the front of the pawl arm 106 resides in front of the tooth 114 and is not in contact therewith.
  • the tooth 114 is engaged and part of the pawl glides on the lower surface as the trigger is pulled rearwardly.
  • the pawl arm 106 is then deflected and stressed downwardly until the rearmost position of the trigger is reached.
  • the pawl arm 106 then leaves the surface and pops to a stress- relieved position.
  • the trigger is released, the pawl arm comes down into contact with the top surface, and thereafter is deflected upwardly and stressed until the trigger reaches a full forward position. At this time, the pawl arm snaps back to its original non-contacting position ready for the next cycle.
  • the pawl arm 106 is resilient and deflectable so that it generally rides on the camming surface 112 of the ratchet 110 until it is initially deflected downwardly and is locked behind the tooth 114 precluding its forward travel. This locked position of the pawl arm 106 and trigger element 18 to which it is connected occurs almost immediately after the trigger element 18 is initially pulled back to start a cycle for the placement of a staple.
  • the curved slot 34' provided on at least one of the handles, shown in 98 on Figure 9 provides a tracking path for locking in position at any given point the strap 32 during the stroke or cycle of operation of the stapler so that the flexible strap 32 cannot be kinked since it is forced to travel along the fixed glide path.
  • the ratchet 115 forms a downwardly extending cam track 116 with a front tooth 118 which is engageable with a pawl arm 120 having a channel-shaped projection 122 which rides on the cam track 116 as the trigger element 18 is pulled back (Figure 17).
  • the front tooth 118 prevents the pawl arm 120 from moving forward once the tooth 118 snaps behind the channel-shaped projection 122.
  • the pawl arm 120 rides on the top camming surface 124 of the ratchet 115.
  • the operating cycle of this modification is essentially the same as that described hereinabove for the ratchet mechanism of Figures 9-15.
  • a second tooth 118' may also be employed with both ratchet embodiments for precluding the trigger from inadvertently releasing with full retracted force into the front tooth 118 in the event the handle slips or the trigger is released unintentionally.
  • Such a second tooth 118' would protect the pawl arm 120 of the half 96 from fracturing if the trigger was accidentally released in the fully retracted position as the second tooth 118' would stop the pawl arm and released trigger in its rearward positions and keep same from rushing forward into the first tooth 118.
  • the second tooth is preferably placed in the pre-cocked position where the staple is just about ready to be formed about the anvil.
  • FIGS 20-24 diagrammatically illustrate a few alternate forms of our disposable skin stapler.
  • the driver 150 is provided with an extension in the form of a "thumb" finger loop 152 for actuation of the stapler as shown in phantom, and as is similarly done with a conventional type of syringe, wherein additional finger loops 154, 156 are provided on opposite sides of the body or housing 82 for holding purposes.
  • the housing 82 further encompasses all of the other elements of the skin stapler, namely, the ejector, the bottom cover, follower, top cover and the escapement spring.
  • the driver 150 is provided with an extension in the form of a "thumb" finger loop 152 for actuation of the stapler as shown in phantom, and as is similarly done with a conventional type of syringe, wherein additional finger loops 154, 156 are provided on opposite sides of the body or housing 82 for holding purposes.
  • the housing 82 further encompasses all of the other elements of the skin stapler,
  • Such a stapler may be of the "single shot” type or it may be provided with a plurality of staples just like the embodiment of Figures 1-8.
  • a compression spring may be employed between the finger loop 152 and the housing 82 so as to return the driver 150 to its unactivated position.
  • Figure 21 illustrates another alternate form of our stapler in side elevation, wherein an extension 160 of the driver 162 is in the form of a sliding handle and a fixed trigger element 164 forms part of and or extends from the body or housing 82.
  • a return spring 166 may be employed between the handle 160 and trigger 164 for returning the handle to its normal position.
  • Figure 22 is similar to that of Figure 21, but employs a pivoting type of handle 160' pivoted at 168 and is provided with a slot 170 for engagement with a pin 172 provided on the driver 162'.
  • This skin stapler operates in essentially the same manner as that of Figure 21, but it has a "closed" handle portion in lieu of an open handle portion.
  • Figure 23 further illustrates a very compact form of stapler wherein handle means in the form of a pair of connecting pivotable or toggle links when actuated provide together the driving force for the driver 174.
  • the handle link 176 is attached to an extension 175 of the housing 82 and is squeezed for moving the driver 174 forward by means of an intermediate link 178.
  • Spring 180 returns the links to their normal position as shown by the solid lines.
  • Figure 24 is similar to Figure 23, except that here the handle link 176' is pivoted and attached up front to the housing 82, with the intermediate link 178' and spring 180' in generally the same positions.
  • Figures 25-30 show a preferred construction of the stapler mechanism of the apparatus of the invention.
  • the leading edges of the forward or first staple pushes down the paired tangs or legs 200 extending from the end of ejector 202 as the staple 204 advances forward to be formed about an anvil 208.
  • the legs 200 immediately push up the staple 204 and advance it off the anvil 208. Constant pressure is therefore maintained on the staple 204 as it is moved to the front of the stapler.
  • the legs or tangs are inclined slightly upwardly about 10° to further aid in keeping the staple 204 in position and precluding it from dropping forward or falling loose at the front of the stapler.
  • driver 206 is suitably provided with groove means 212 which cooperates with pin means 214 in the bottom cover 210. With such disposed pin and groove means or vice-versa, the staple is precisely aligned or centered about the anvil even though the width of the single track is slightly larger than the width of the staples to allow for clearance.
  • This alignment feature between driver and bottom cover, as well as the modified ejector and escapement spring or release member 216 are interchangeable with and may be substituted in lieu of the ejector 86, driver 22, escapement spring 76, and top and bottom covers of the embodiment of Figures 1-8.
  • the escapement spring 216 has a delayed raising action (see Figure 27) due to the driver 206 moving a greater forward distance before urging the spring up. This action ensures that only one staple is acted on at any one time by the driver.
  • the staple 190 comprises seven portions, a curved central portion 192 smaller than the width of the anvil, and on opposite sides thereof short upwardly and outwardly portions as well as short downwardly and outwardly portions, all of the same length, connected together by curved portions.
  • the staple enters and leaves the suture site with minimum trauma as the ends of the staple track the same path generally in each operation; and the retention power of the staple is more than satisfactory for its purpose.
  • the diameter or wire size of the staple may be of any suitable size, such as, for example, .0225" or .021" and may be fabricated from a suitable stainless steel, with as reference anvil width of .230 inch for the heavier staple and .173 inch for the lighter staple.
  • Such staples provide a generally closed box-like configuration when fully formed about the anvil with their sharp pointed tips just about "kissing" each other when the staple is closed, to form a parallelogram structure, as shown in Figure 32.
  • Other suitable rod material such as a wire with, for example, pairs of flats, may be employed with the stapler of the invention.
  • Such a square or other shaped wire lends itself to improved feeding characteristics minimizing jamming of the staples in the feeding track, and a square wire or wire with flats also exhibits other desirable features over round wire staples insofar as manufacture is concerned.
  • a row of staples 74 which are included with the skin stapler, are positioned atop driver 22 slidably mounted between the top and bottom covers 80 and 84 which are suitably secured together by extending elements 126 suitably crimped over notched out areas 128 of the top cover 80.
  • top and bottom covers 80 and 84 are fixed in place in the housing 12 by suitable means, such as the upwardly extension 130 which engages a slot 132 in the housing 12, and by a downwardly tip projection 134 of an arrowhead at the front of the housing 12 which arrowhead incidentally simply alerts the doctor or surgeon to point the nose of the stapler with the approximating blade 102 and the incision 140 at the point at which staples are to be placed.
  • Slidably mounted above the driver 22 is a follower 72 which continually urges the row of staples against a conforming front underside surface of the escapement spring 76 ( Figure 8) or top housing cover, as best shown in Figure 29.
  • a resilient ejector 86 Attached to the bottom cover 84 is a resilient ejector 86 which is provided with a a pair of upwardly projecting fingers 136 extending on both sides of the anvil 61.
  • the ejector 86 is displaced downwardly out of the way when the trigger element 18 is pulled during crimping of a staple 74 by the elongated dimple 88 of the driver 22; and the fingers 136 lift a crimped staple 74 from the anvil 61 ( Figures 7a-7b) when the trigger element 18 is released to return the stapler mechanism to its original start position.
  • the staples are visible to a doctor or surgeon thus giving an idea as to the number of staples 74 remaining in the stapler 10.
  • the stapler 10 does not employ replaceable staple cartridges, the entire stapler must be discarded and a new one used to complete a job. It is understood that even if only one or two staples are used for a suture, the stapler would still be discarded and not used again as such practice eliminates the problem of sterilization and contamination.
  • the start of a staple placement cycle generally commences when a single staple 74 is urged into position in front of the driver 22 the instant the driver 22 commences its retraction mode which is when the trigger element 18 is released and the actuating drum 24 pulls the driver 22 back. Thereafter, the driver 22 is advanced to commence bending the staple 74 around the anvil 61 and finally closing the staple 74, when the trigger element 18 is completely pulled in. Subsequently thereto, the trigger element 18 is released pulling back the driver 22, and the crimped staple 74 is lifted off the anvil 61 by means of the ejector's fingers 136, and a new cycle is commenced by the next staple urged into position in the same manner as experienced by the first staple. All of these sequences are clearly shown in Figures 4-7 in the various plan and sectional views taken generally along numerous section lines.
  • the ratchet mechanism is operative during each cycle or sequence of staple placement or operation as it precludes double-loading and ensures at all times that only one staple is being acted upon during any one cycle of operation. Thus, such a mechanism aids in preventing jamming as once a cycle is started, it must be completed before a new cycle is commenced.
  • the toothed elements of each ratchet mechanism disclosed herein thus engage the pawl arm to stop the stapler from being recycled in "mid-stream" before a full cycle of operation is made with the trigger.
  • Another feature of the present invention is the curved shape of the top portion of the frame structure. This curved section and nose portion at the distal end thereof greatly increases visibility at the work site as the stapler does not block the surgeon's line of sight during use of the instrument.
  • the follower is preferably made of a low friction material to facilitate movement of same between the driver and the top cover, while the elements of the housing other than the follower including top and bottom covers, ejector, driver and release member or escapement spring are all of a suitable metal, such as stainless steel.
  • the handle or frame portion including the trigger element may comprise an injection molded plastic material which is capable of sterilization as an assembled unit and is subject to complete sterilization once the staples are stacked in the stapler or housing and all parts of the stapler are secured together.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Surgery (AREA)
  • General Health & Medical Sciences (AREA)
  • Veterinary Medicine (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Animal Behavior & Ethology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Public Health (AREA)
  • Engineering & Computer Science (AREA)
  • Surgical Instruments (AREA)
  • Materials For Medical Uses (AREA)
  • Saccharide Compounds (AREA)
  • Prostheses (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
  • Control Of Combustion (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Glass Compositions (AREA)
EP83302350A 1982-05-04 1983-04-26 Surgical stapler Expired EP0094752B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83302350T ATE31012T1 (de) 1982-05-04 1983-04-26 Chirurgisches klammerinstrument.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/374,692 US4523707A (en) 1982-05-04 1982-05-04 Surgical stapler
US374692 1982-05-04

Publications (3)

Publication Number Publication Date
EP0094752A2 EP0094752A2 (en) 1983-11-23
EP0094752A3 EP0094752A3 (en) 1984-10-24
EP0094752B1 true EP0094752B1 (en) 1987-11-25

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EP83302350A Expired EP0094752B1 (en) 1982-05-04 1983-04-26 Surgical stapler

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KR (1) KR860001046B1 (ja)
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AU (2) AU543875B2 (ja)
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DE (1) DE3374655D1 (ja)
DK (1) DK163561C (ja)
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KR840004506A (ko) 1984-10-22
IL68551A (en) 1987-12-31
DK163561C (da) 1992-08-17
NO831550L (no) 1983-11-07
AU566295B2 (en) 1987-10-15
EP0094752A2 (en) 1983-11-23
CA1193937A (en) 1985-09-24
KR860001046B1 (ko) 1986-08-01
ES281091Y (es) 1985-10-01
ES279655U (es) 1984-12-16
ES279655Y (es) 1985-07-01
DE3374655D1 (en) 1988-01-07
MX161317A (es) 1990-09-10
FI831518A0 (fi) 1983-05-03
ES279654Y (es) 1985-07-01
IL68551A0 (en) 1983-09-30
DK163561B (da) 1992-03-16
JPS6237983B2 (ja) 1987-08-14
MX153305A (es) 1986-09-11
EP0094752A3 (en) 1984-10-24
AU543875B2 (en) 1985-05-09
ZA833131B (en) 1984-01-25
AU3752285A (en) 1985-05-16
IE54187B1 (en) 1989-07-05
US4523707A (en) 1985-06-18
BR8302285A (pt) 1984-01-03
ES279654U (es) 1984-12-16
IE831018L (en) 1983-11-04
DK196383A (da) 1983-11-05
DK196383D0 (da) 1983-05-03
JPS62253044A (ja) 1987-11-04
AU1417883A (en) 1983-11-10
ATE31012T1 (de) 1987-12-15
JPS58203747A (ja) 1983-11-28
NO162364B (no) 1989-09-11
FI80205C (fi) 1990-05-10
ES281091U (es) 1985-02-16
FI80205B (fi) 1990-01-31

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